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Investigating the effect of renewable energy on the drivers of climate change correctly is significant as it is the basic source of climate change mitigation. In the extant literature, its effect on climate change has been estimated predominantly by regressing aggregate rather than sectoral renewable energy use either on aggregate greenhouse gas emissions or the components of greenhouse gases (GHGs) like carbon dioxide emissions. Against this backdrop, the paper investigates if we should estimate the nexus (i) by the causal effects running from aggregate or sectoral renewable energy use to GHG emissions and (ii) by the causal effects running from renewable energy consumption to aggregate GHG emissions or to its components like carbon dioxide (CO2) emissions. To this end, the paper introduces negative and positive (functional) complementarity between sectoral renewable energy consumptions in reducing or increasing GHG emissions, takes 20 OECD countries from 1990 to 2019, and uses augmented and non-augmented auto-regressive distributed lag approach and vector error correction mechanism. The study finds substantial differences among the results coming out of (i) regressing aggregate and sectoral renewable energy consumption on GHG emissions and (ii) regressing renewable energy consumption on aggregate GHG emissions and on CO2 emissions. The paper suggests regressing sectoral rather than aggregate renewable energy consumption on the components of aggregate GHG emissions like CO2 emissions rather than on aggregate GHG emissions to produce workable, specific, and conclusive policy alternatives. [ABSTRACT FROM AUTHOR]

Climate change is progressing faster than previously envisioned. Efforts to mitigate the challenges of greenhouse gas emissions by countries through the establishment of the Intergovernmental Panel on Climate Change has resulted in continuous environmental improvements in the energy efficiency and carbon emission signatures of products. In this paper, an energy–carbon emissions nexus causal model was applied using the Leontief Input–Output mathematical model for low-carbon products in future transport-manufacturing industries., The relationship between energy savings, energy efficiency, and the carbon intensity of products for the carbon emissions signature of the future transport manufacturing in South Africa was established. The interrelationship between the variables resulted in a 29% improvement in the total energy intensity of the vehicle body part products, 7.22% in the cumulative energy savings, and 16.25% in the energy efficiency. The scope that has been examined in this paper will be interesting to agencies of government, researchers, policymakers, business owners, and practicing engineers in future transport manufacturing and could serve as a fundamental guideline for future studies in these areas. [ABSTRACT FROM AUTHOR]

Household energy consumption has been one of the most critical factors to climate change. We conducted bibliometric research on household energy consumption by using CiteSpace and HistCite. The Web of Science was used to identify and visualize the evolution of paper citation diagram, the collaboration network, the cocitation network and emerging trends by mapping the knowledge domain of 2984 academic publications between 2011 and 2018 related to household energy consumption. The results showed that the number of academic articles published in the field of household energy consumption and carbon emissions was on the rise, but the number of highly cited articles decreased. The most productive authors and institutions in this subject are in Australia, the USA, China, Britain and Germany. Much of the research has focused on electricity consumption and heat supply, while there have been few studies on other subdomains in the area of energy consumption. The impact of greenhouse gases produced by energy consumption on the environment was the focus of this study. Here, we present an in-depth analysis of household energy consumption and carbon emission research to better understand global trends and hot topics in this field which have emerged over the last few years. [ABSTRACT FROM AUTHOR]

There is a growing attention on the role of rapidly growing developing countries in mitigating climate change, especially in curbing the emissions of greenhouse gases. Estimates show that in the year 2011, carbon dioxide (CO2) emissions from developing countries constituted about 63% of the world's total, compared with only 37% for developed countries. Thus, developing countries must be an integral part of global actions toward combating climate change. In Saudi Arabia, the energy use per capita of 6937.23 kg of oil equivalent in 2014 was 3.6 times the global average and the per capita CO2 emission of 19.53 metric tons was the seventh highest. With sensitive ecosystems, limited freshwater resources and substantial coastal developments, the country is vulnerable to climate change. As such, the country has recently initiated some sustainable urban planning strategies in its major urban centers as part of its climate change mitigation and adaptation efforts. However, few studies have assessed the extent of the implementation of the strategies. Based on secondary data analysis, this article found that the implementation of the strategies is at infancy with urban greening, public transportation, and green building projects gradually gaining prominence. The paper recommends more focus on rising building and population density, mandating mixed land uses, as well as public enlightenment and engagement about climate change impacts and energy choices. [ABSTRACT FROM AUTHOR]

Global warming, climate change, and resource depletion have forced us to reconsider energy usage and efficiencies over the last few decades. Residential and commercial buildings are both large energy consumers, so improving energy and material usage efficiency in this sector is a common research topic. According to a recent study, the Building Sector (BS) accounts for 40% of greenhouse gas emissions. The primary objective of this paper is to examine and assess the potential of Renewable Energy Systems (RES) and their combinations for enhancing energy efficiency in the BS. Specifically, the focus will be on converting low energy-efficient buildings into highly efficient ones. The potential of the RES and their combinations for the BS is evaluated based on payback durations, energy generation, and reduction of CO 2 emissions. The optimization flow charts for the RES, feasibility studies, commercialization road maps of energy storage systems and the necessity of control mechanisms for enhancing RES efficiency were discussed. Additionally, the technology drawbacks are discussed, along with various innovative techniques recommended to direct future study in this area. Finally, this article assists the audience clear idea in the selection of the right combination of potential RES based on different conditions to achieve deep decarbonization in BSs. • Buildings sector (BS) responsible for 40% of GHG emissions. • Study assesses potential of Renewable Energy System (RES) in BS. • RES evaluated on payback, energy generation, and CO 2 reduction. • Optimization, feasibility and commercialization studies were discussed. • Article recommends right RES combinations for deep decarbonization in BS. [ABSTRACT FROM AUTHOR]